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*DECK SYB4T2
SUBROUTINE SYB4T2 (NIR,JMINRA,XCOTEA,SINPHI,DCOTEB,COSPHI,ORIGIN,
& PENTES,ANGLES,IXRAYO,HXRAYO,DXMIN,DELTAC)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Compute the position of the next track intersecting with side 2 (west
* side) in a sectorized Cartesian cell.
*
*Copyright:
* Copyright (C) 2002 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): A. Hebert
*
*Parameters: input
* NIR number of radius.
* JMINRA index of the first radius intercepting the side.
* XCOTEA radius interceptions.
* SINPHI sinus
* DCOTEB half-side of the rectangle (center-side position).
* COSPHI cosinus.
* ORIGIN origin of the track.
* PENTES slope of the track.
* ANGLES slope of the sector.
* IXRAYO index of the radius.
* HXRAYO central radius (generally a negative number).
* DXMIN accuracy.
*
*Parameters: output
* DELTAC position of the next trajectory.
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER NIR,JMINRA,IXRAYO
REAL XCOTEA(JMINRA:NIR),SINPHI,DCOTEB,COSPHI,ORIGIN,PENTES,
& ANGLES,HXRAYO,DXMIN,DELTAC
*
* Rayon Exterieur Suivant
IF (JMINRA .LE. NIR) THEN
H0 = - DCOTEB * SINPHI
IF ((IXRAYO .EQ. JMINRA) .OR. (HXRAYO .GE. H0)) THEN
IR = IXRAYO
S = 1.
ELSE
IR = IXRAYO - 1
S = - 1.
ENDIF
IF (IR .LE. NIR) THEN
X = S * XCOTEA(IR)
D = DCOTEB * COSPHI + X * SINPHI
DELTAC = MIN(DELTAC, D)
ENDIF
ENDIF
*
* Secteur Suivant
DA = ANGLES - PENTES
D = ABS(ANGLES) + ABS(PENTES)
IF (ABS(DA) .GT. DXMIN*D) THEN
D = ORIGIN / DA
DELTAC = MIN(DELTAC, D)
ENDIF
*
RETURN
END
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